package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * Author:
 */


@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    
    
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    
    @Autowired
    private DishMapper dishMapper;
    
    @Autowired
    private SetmealMapper setmealMapper;
    
    
    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        
        // 获取当前用户的id
        Long userId = BaseContext.getCurrentId();
        // 只能查询自己购物车的数据
        shoppingCart.setUserId(userId);
        
        // 判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        
        if (shoppingCartList != null && shoppingCartList.size() == 1) {
            // 说明存在，商品数量就+1
            ShoppingCart cart = shoppingCartList.get(0);
            cart.setNumber(cart.getNumber() + 1);
            // 在把新的数量更新到数据库中
            shoppingCartMapper.updateNumberById(cart);
        } else {
            // 如果不存在，需要插入一条新数据，还要判断用户添加的是套餐还是菜品
            Long dishId = shoppingCart.getDishId();
            
            if (dishId != null) {
                // 本次添加的是菜品
                // 因为我们的列表中有菜品数据，所以直接可以查到当前添加的菜品数据信息
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                // 添加的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
            
        }
        
    }
    
    
    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        return shoppingCartList;
    }
    
    
    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
    
    
    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        
        if(list != null && !list.isEmpty()){
           ShoppingCart cart = list.get(0);
            
            Integer number = cart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(cart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }
    }
}
